I don't know. These are ingame invents happening on every connected machine in operation at once so there's no gathering. I think Sega posts videos of some of theses races (recorded ingame) on their YouTube channel from time to time.

Other random events happen; One day I passed by an Initial D 8 machine and saw that for 2 days, you get a free continue. Nice to upgrade your car faster!

The 12th revision of Initial D Arcade Stage 8 Infinity version 1.2 ("Version 1.2 +D Rev.12" and "Version 1.2 EXP +D Rev.12") was released on December 8. As usual, this update brings some balance to car power in "Online Battle" mode.